Search: Sea Salt Test Kit Water Treat     Product： KH Test Kit Sort： Test Kit Content： Marine Life KH Test Kit can easily and rapidly determine the carbonate hardness of aquarium water .The carbonate hardness indicates the buffer capacity of water .The fresh water carbonate hardness should be kept at 5-10°dKH,the seawater carbonate hardness should be kept at 8-12°dKH.When the water carbonate hardness drops,Marine Life KH plus will be suggested to use.